PO 1234 has only one line with qty details: ordered qty :1, received qty: 1
Now an invoice was created from external application and imported to Oracle where invoice was made with partial PO qty with 0.36 only.
and it was paid and accounted too.
so remaining qty to be billed is : 0.64

Now another invoice was created from the external application and imported to Oracle where invoice was made with partial PO qty with 0.42
here I had discarded the PO line due to some reason and later i had tried to enter the same line manually with qty 0.42
but this time when i save the form, system automatically changes the qty to remaining 0.64 instead partial qty 0.36 which i wish.

Can anyone help me why i could not create invoice with partial qty 0.42 manually ??